Compare BMW M6 E64 Convertible vs BMW Z3 M Roadster vs Alpina Roadster S
Variants
M6
M6 DCT
S50
S54
Capacity
Cargo Capacity
300 L / 10.6 cu-ft ~ 350 L / 12.4 cu-ft
165 L / 5.8 cu-ft
240 L / 8.5 cu-ft ~ 260 L / 9.2 cu-ft
Coolant Capacity
15.0 L / 15.9 qt
10.8 L / 11.4 qt
Engine Oil Capacity
5.5 L / 5.8 qt
Fuel Capacity
70.0 L / 18.5 gal
51.0 L / 13.5 gal
55.0 L / 14.5 gal
Passengers
4
2
2
Payload
300 kg / 661 lbs
Chassis
Brakes | Front
Ventilated discs
Ventilated discs
Ventilated discs
Brakes | Rear
Ventilated discs
Ventilated discs
Ventilated discs
Power Steering
Hydraulic Steering
Hydraulic Steering
Suspension | Front
MacPherson strut
MacPherson strut
MacPherson strut
Suspension | Rear
Multi-link
Multi-link
Double-wishbone
Tire Size
255/40 R19, 285/35 R19
235/35 R19, 265/30 R19
Turning Circle
12.5 m / 41.0 ft
9.8 m / 32.1 ft
Construction
Body Style
2-door Convertible
2-door Convertible
2-door Convertible
Dimensions
Size | Height
1377 mm / 54.2 in
1300 mm / 51.2 in
Size | Length
4871 mm / 191.8 in
4025 mm / 158.5 in
4090 mm / 161.0 in
Size | Width
1855 mm / 73.0 in
1740 mm / 68.5 in
1780 mm / 70.1 in
Track Width | Front
1567.0 mm / 61.7 in
1422.0 mm / 56.0 in
1470.0 mm / 57.9 in
Track Width | Rear
1584.0 mm / 62.4 in
1492.0 mm / 58.7 in
1520.0 mm / 59.8 in
Weight
1320.0 kg / 2910.1 lbs
Wheel Size
8.5J x 19, 9.5J x 19
17 in
8.5J-9.5J X 19
Wheelbase
2781 mm / 109.5 in
2500 mm / 98.4 in
Performance
Acceleration | 0 - 100 km/h
4.8 sec
5.3 sec
Acceleration | 0 - 60 mph
4.6 sec
5.0 sec
CO2 Emission
366 g/km
Coefficient Of Drag
0.34
Fuel Economy
15.2 L/100km / 15.5 MPG (combined) | 22.8 L/100km / 10.3 MPG (urban) | 10.7 L/100km / 22.0 MPG (highway)
16.6 L/100km / 14.2 MPG (urban) | 7.9 L/100km / 29.8 MPG (highway)
15.0 L/100km / 15.7 MPG (urban) | 7.0 L/100km / 33.6 MPG (highway)
Top Speed
250.0 km/h / 155.3 mph
250.0 km/h / 155.3 mph
265.0 km/h / 164.7 mph
Powertrain
Drivetrain Layout
Front-engine (longitudinal), Rear-wheel drive
Front-engine (longitudinal), Rear-wheel drive
Front-engine (longitudinal), Rear-wheel drive
Emission Standard
Euro 4
Engine
S85B50
Engine | Bore
92.0 mm / 3.6 in
87.0 mm / 3.4 in
Engine | Compression Ratio
12.0:1
10.2:1
Engine | Displacement
5.0 L / 305.1 cu-in / 4999.0 cc
3.3 L / 204.2 cu-in / 3346.0 cc
Engine | Power
507.0 hp / 378.1 kW @ 7750 rpm
300.0 hp / 223.7 kW @ 6300 rpm
Engine | Specific Output
101.4 hp/L / 1.7 hp/cu-in
89.7 hp/L / 1.5 hp/cu-in
Engine | Stroke
75.2 mm / 3.0 in
91.0 mm / 3.6 in
93.8 mm / 3.7 in
Engine | Torque
520 Nm / 383.5 lb-ft @ 6100 rpm
362 Nm / 267.0 lb-ft @ 4800 rpm
Engine | Type
Naturally-aspirated multi-port injected petrol V10 DOHC engine with 4 values per cylinder
Naturally-aspirated multi-port injected petrol inline-6 DOHC engine with 4 values per cylinder
Naturally-aspirated multi-port injected petrol inline-6 DOHC engine with 4 values per cylinder
Transmission | Gears
5-speed
5-speed
Transmission | Type
Manual
Manual
Production
Availability
2005 ~ 2010
2003 ~ 2006
Reviews
Neofiliac score
85%
66%
87%
Pros
- Characterful S85 engine
- Great looks with the top down
- Good power delivery
- Good engines
- Simple to work on
- No BS driving experience
- Gorgeous styling
- Manual transmission
- Good performance
- Small turning circle
Cons
- Very high fuel consumption
- Horrible engine reliability
- Does not handle well
- Stuck with MacPherson struts in the front
- Very little cargo space
- Heavier than the MX-5 and handles worse (but much more expensive)
- Low cargo capacity
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